AbstractThe production of glasshouse ornamentals in the Netherlands occupies an area of 5278 ha. The total production value is 5·76 billion Dutch guilders. A characteristic of the Dutch ornamental industry is the wide range of products. About 110 species of cut flower and 300 species of pot plant are grown. Reduction of pesticide use can be achieved by the development of alternative and additional methods, like the use of monitoring techniques, natural enemies, host‐plant resistance and closed systems. Information is presented referring to developments in research, extension and practical application of these metho
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